Bug with alias const(type)? (DMD 2.003)

[Tim Healey]

I'm writing a class that I'm trying to keep compatible with D version 1 
but also playing with features of D version 2 (using DMD 1.020 and 2.003 
respectively). For the compatibility, I was using a version block to 
create aliases for const versions of one type for D 2 and just regular 
non-const versions D 1.

The issue I'm having:

class A { }

class B( TYPE ) {
	TYPE scalar;
	TYPE[] array;
	alias const( TYPE )   CONST_TYPE;
	alias const( TYPE )[] CONST_ARRAY;
const:
	// This member function compiles fine in DMD 2.003
	CONST_ARRAY bar()
	{
		return array;
	}
	// This member function fails to compile in DMD 2.003 with
	// the error: cannot implicitly convert expression
	// (this.scalar) of type const A to constbug.A.
	CONST_TYPE foo()
	{
		return scalar;
	}
	// Commenting out the above version and using the following
	// works as expected.
//	const(TYPE) foo()
//	{
//		return scalar;
//	}
}

void main()
{
	B!( A ) test = new B!( A );
}

Is it me, or is it rejecting valid code?